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RELEASE_NOTES
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###############################################################################
# #
# Trilinos Release 16.0 Release Notes TBD May/June, 2024 #
# #
###############################################################################
A large number of packages have been marked as deprecated in this release.
We are planning to remove them in the fall of 2025. The list of packages is
- Amesos
- AztecOO
- Epetra
- EpetraExt
- Ifpack
- Intrepid
- Isorropia
- ML
- NewPackage
- Pliris
- PyTrilinos
- ShyLU_DDCore
- ThyraEpetraAdapters
- ThyraEpetraExtAdapters
- Triutils
If you are a user of one of these packages, please transition to the newer
software stack. If you need guidance with finding an adequate replacement
or are missing a particular feature, please open an issue or a discussion
on Github.
Amesos2
- Add interface to MKL cluster sparse solver.
https://github.com/trilinos/Trilinos/pull/13073
Framework
- Marked all deprecated packages as 'Secondary Tested'.
- Reset default for `Trilinos_ENABLE_SECONDARY_TESTED_CODE` to `OFF`.
This will cause the previously-mentioned deprecated packages to NOT be
automatically enabled to help guide users away from them. The old
behavior can be restored by setting the variable back to `ON`, but note
that the recommended best practice is to explicitly enable packages that
the user is depending on (e.g. if you depend on ThyraEpetraAdapters, enable
that explicitly instead of Thyra and Epetra and allowing TriBITS to enable
the adapters).
- Added deprecation warnings to all deprecated packages. The warnings are able
to be disabled via the `Trilinos_SHOW_DEPRECATED_WARNINGS` option (this is
also available as a per-package option). These warnings are intended to
notify users that package capability they are using will be removed in upcoming
releases.
https://github.com/trilinos/Trilinos/pull/12828
Ifpack2
- RBILUK now supports Kokkos Kernels as a backend
https://github.com/trilinos/Trilinos/pull/12911
Kokkos, Kokkos Kernels
- Inclusion of version 4.3.1 of Kokkos and Kokkos Kernels
https://github.com/trilinos/Trilinos/pull/12995
NOX
- Added preconditioner reuse across multiple nonlinear solves.
https://github.com/trilinos/Trilinos/pull/12986
Teko
- Add Hierarchical Block Gauss-Seidel Capability
https://github.com/trilinos/Trilinos/pull/13040
Tpetra
- Some Tpetra features can be toggled via environment variables.
When an unrecognized variable is found, Tpetra now throws to alert
to potentially misspelled variables.
https://github.com/trilinos/Trilinos/pull/12944
- Add a test that checks that vendor TPLs for sparse matrix-vector product
are called.
https://github.com/trilinos/Trilinos/pull/13018
- Add team parallelism to kernels associated with matrix equilibration.
https://github.com/trilinos/Trilinos/pull/13017
###############################################################################
# #
# Trilinos Release 15.1.0 Release Notes February 26, 2024 #
# #
###############################################################################
Amesos2
- The interface to SuperLU_DIST now also works for the CUDA-enabled
variant of the library.
https://github.com/trilinos/Trilinos/pull/12524
Framework
- Began using semantic versioning for Trilinos with 15.1.0 release.
Ifpack2
- BlockRelaxation can now generate blocks using a Zoltan2.
https://github.com/trilinos/Trilinos/pull/12728
Kokkos & Kokkos Kernels
- Inclusion of version 4.2.1 of Kokkos and Kokkos Kernels
https://github.com/trilinos/Trilinos/pull/12707
MueLu
- The reformulated Maxwell solver (RefMaxwell) was generalized to
also work for grad-div / Darcy flow problems.
https://github.com/trilinos/Trilinos/pull/12142
- In an effort to consolidate the old non-Kokkos code path with the
newer Kokkos code path, the following factories were deprecated
and should be removed from input decks: NullspaceFactory_kokkos,
SaPFactory_kokkos, UncoupledAggregationFactory_kokkos.
https://github.com/trilinos/Trilinos/pull/12720
https://github.com/trilinos/Trilinos/pull/12740
Panzer
- MiniEM can now also assemble and solve Darcy problems using first
or higher order mixed finite elements.
https://github.com/trilinos/Trilinos/pull/12142
PyTrilinos2
- New package that auto-generates Python interfaces for Trilinos
packages. Currently, most of Tpetra is exposed. We are planning on
adding other packages.
https://github.com/trilinos/Trilinos/pull/12332
ROL
- An auto-generated Python interface was added. A standalone Python
package can be downloaded from rol.sandia.gov
https://github.com/trilinos/Trilinos/pull/12770
Teko
- Block Jacobi and Gauss-Seidel methods allow now to specify
preconditioners for the iterative solves of the diagonal blocks.
https://github.com/trilinos/Trilinos/pull/12675
Tpetra
- Tpetra will now assume by default that the MPI library is GPU
aware, unless automatic detection or the user indicates otherwise.
https://github.com/trilinos/Trilinos/pull/12517
- Reject unrecognized TPETRA_* environment variable. Misspelled or
removed environment variables are no longer silently ignored.
https://github.com/trilinos/Trilinos/pull/12722
- In order to allocate in shared host/device space (i.e.
CudaUVMSpace, HIPManagedSpace or SYCLSharedUSMSpace) by default,
please use the CMake options
KokkosKernels_INST_MEMSPACE_CUDAUVMSPACE=ON
Tpetra_ALLOCATE_IN_SHARED_SPACE=ON
https://github.com/trilinos/Trilinos/pull/12622
###############################################################################
# #
# Trilinos Release 15.0 Release Notes November 16, 2023 #
# #
###############################################################################
CMake
- Change the default for `Trilinos_MUST_FIND_ALL_TPL_LIBS` from `OFF` to
`ON`. It was turned off by default because it breaks backward
compatibility but it also causes problems for new users and new
configurations.
Users that do not want this new behavior can set
`-D Trilinos_MUST_FIND_ALL_TPL_LIBS=OFF`, which is backward compatible.
- Change the default for `Trilinos_USE_GNUINSTALLDIRS` from `OFF` to `ON`,
in the goal to move Trilinos and TriBITS to modern CMake.
TriBITS has had the ability to use that paths selected by the standard
CMake module `GNUInstallDirs.cmake` for a long time. But it is turned off
in TriBITS by default and was never turned on in Trilinos, both for the
sake of backward compatibility.
This may break people's existing configurations because it will install
libs in `<prefix>/libs64/` instead of in `<prefix>/libs/` on many systems
(e.g. Linux systems). For example, this will break downstream CMake
projects that call `find_package(Trilinos ...)` before defining the
compilers (e.g. so they can get the compilers from Trilinos). If the
compilers are not defined, `find_package()` will not search
`<prefix>/lib64`. To revert back to using `<prefix>/lib` but still use
`GNUInstallDirs.cmake` for Trilinos, set `-D
CMAKE_INSTALL_LIBDIR:STRING=lib` when configuring Trilinos. To avoid the
`find_package(Trilinos ...)` problem not searching `<prefix>/lib64`,
consider explicitly specifying the compiler to and having the downstream
CMake project define the compilers first with `project(<ProjectName>
COMPILERS C CXX ...)` before calling `find_package(Trilinos ...)`. (That
is, don't try to get the compilers from the installed Trilinos, see
https://github.com/trilinos/Trilinos/issues/12306.)
NOTE: The setting `-D Trilinos_USE_GNUINSTALLDIRS=OFF` is deprecated and
may be removed in the future. (I.e. the usage of `GNUInstallDirs.cmake`
may be hard-coded in the future so please try adjusting to the usage of
`GNUInstallDirs.cmake` by Trilinos.) See
https://github.com/trilinos/Trilinos/issues/12104#issuecomment-1691945033
for additional details and instructions.
Amesos2
- Updates to STRUMPACK, SuperLU_DIST, MUMPS and LAPACK adapters
Anasazi
- Randomized eigensolver
- Improved testing with Tpetra
Belos
- Extend GCRO-DR linear solver to use Kokkos linear algebra for GEMMA
- Improved testing with Tpetra
Domi
- Package has been deprecated and removed from Trilinos
FEI
- Package has been deprecated and removed from Trilinos
Ifpack2
- 4th kind Chebyshev smoother
- Algorithmic and performance improvements for BlockTriDiag and BlockJacobi.
- Stream based RILU(k) and triangular solves
- Optimize Kokkos Kernels MDF ILU(0) solver and expose it in Ifpack2
- Patch solver with data compression
Komplex
- Package has been deprecated and removed from Trilinos
Moertel
- Package has been deprecated and removed from Trilinos
MueLu
- Better ML/MueLu compatibility (parameter translation, aggregation
algorithms, ..)
- Reitzinger-Schoberl type multigrid for Maxwell problems
- BlockCRS support
- Improved setup performance on device (TAFC Tpetra changes)
- Matrix-free multigrid with user-specified operators
- AMG for hierarchical matrices
NOX
- Refactored internal use of model evaluators
- LOCA Householder constraint solver can now be nested within a
Tempus transient problem (Tpetra version)
Pike
- Package has been deprecated and removed from Trilinos
Rythmos
- Package has been deprecated and removed from Trilinos
ShyLU
- FastILU algorithmic improvements and testing, new block version
- Transpose solve with Basker
- Tacho: runs with HIP.
- FROSch: fully recursive multi-level implementation
- FROSch: monolithic coarse spaces via partition-of-unity approach
- FROSch: GPU capabilities
Stratimikos
- Use of half precision preconditioners (Ifpack2, MueLu, ShyLU/FROSch)
Teko
- Epetra dependency is now optional
TriKota
- Package has been deprecated and removed from Trilinos
###############################################################################
# #
# Trilinos Release 14.2 Release Notes #
# #
###############################################################################
Kokkos
- Subpackages have been removed Kokkos. That means that CMake cache
variables like Trilinos_ENABLE_KokkosCore or
Trilinos_ENABLE_KokkosAlgorithms no longer exist. Now there is just the
top-level package Kokkos enabled with Trilinos_ENABLE_Kokkos. In
addition, all downstream Trilinos packages that had dependencies on Kokkos
subpackages now just depend on the parent package Kokkos. That means that
any optional dependencies on a Kokkos subpackage is now an optional
dependency on the parent package Kokkos. For example, the Sacado package
had an optional dependency on KokkosCore which could be disabled with -D
Sacado_ENABLE_KokkosCore=OFF which now needs to be disabled with -D
Sacado_ENABLE_Kokkos=OFF. In addition, the #define macros for optional
dependencies on Kokkos subpackages have changed names. For example, the
Sacado_config.h file defined the preprocessor macros
HAVE_SACADO_KOKKOSCORE and HAVE_SACADO_KOKKOSCONTAINERS but now just
defines HAVE_SACADO_KOKKOS. Therefore, downstream C++ code will need to
adjust any code that depends on these preprocessor defines. However,
other than changes in the names of the the CMake Cache variables
`<Something>_ENABLE_Kokkos<Subpkg>` to `<Something>_ENABLE_Kokkos` and the
changes in the names of the proprocessor defines ``XXX_KOKKOS<SUBPKG>`` to
``XXX_KOKKOS``, all other behavior should be identical.
###############################################################################
# #
# Trilinos Release 14.0 Release Notes #
# #
###############################################################################
CMake
- A switch to modern CMake targets in IMPORTED library targets in installed
`<Package>Config.cmake` files has been made that **breaks backward
compatibility** for some downstream CMake projects by changing how include
directories are handled:
With the switch to modern CMake IMPORTED targets, now include directories
(along with critical compiler options and other modern CMake usage
requirements) are propagated through linking to the IMPORTED library
targets in downstream customer CMake projects. This makes the usage of
the variables `Trilinos_INCLUDE_DIRS` and `Trilinos_TPL_INCLUDE_DIRS`
unnecessary in downstream CMake projects. The variable
`Trilinos_INCLUDE_DIRS` is still set but the variable
`Trilinos_TPL_INCLUDE_DIRS` is empty in this change to modern CMake. To
get include directories for Trilinos packages and TPLs, one must link
against the Trilinos target `Trilinos::all_libs` or
`Trilinos::all_selected_libs` or by linking against the individual package
targets `<packageName>::all_libs` and/or the TPL targets
`<tplName>::all_libs`. To upgrade downstream CMake projects that are
showing missing include directories (i.e. header files can't be found on
the compile liens) just add `target_link_libraries()` calls with the
appropriate `<prefix>::all_libs` targets for the desired package and/or
TPL. (See the section "Using the installed software in downstream CMake
projects" in the updated build reference guide.) However, backward
compatibility is maintained for most customers which are linking all of
their libraries against `${Trilinos_LIBRARIES}`. For these projects, no
changes will need to be made.
However, this change to modern CMake targets will also cause downstream
CMake projects to pull in include directories as `SYSTEM` includes
(e.g. using `-isystem` instead of `-I`) from IMPORTED library targets.
This changes how these include directories are searched and could break
some fragile build environments that have the same header file names in
multiple include directories searched by the compiler. Also, this will
silence any regular compiler warnings from header files found under these
include directories. This constitutes a **break in backward
compatibility** that will break some customer CMake project builds that
use Trilinos on fragile environments where the search order of the include
directories is important.
There are several different approaches for addressing this change from
`-I` to `-isystem` for the Trilinos include directories described below.
**Approach-1:** Update to CMake 3.23 and set the Trilinos configure
variable:
-D Trilinos_IMPORTED_NO_SYSTEM=ON
This will change back the listing of Trilinos include directories in
downstream customer CMake projects from `-isystem` and `-I` and will
therefore restore about perfect backward compatibility.
**Approach-2:** Set the cache variable
`CMAKE_NO_SYSTEM_FROM_IMPORTED=TRUE` in a downstream CMake project to set
which will restore the include directories for the IMPORTED library
targets for the TriBITS project as non-SYSTEM include directories
(i.e. `-I`) but it will also cause all include directories for all
IMPORTED library targets to be non-SYSTEM (i.e. `-I`) even if they were
being handled as SYSTEM include directories before. Therefore, that could
still break the downstream project as it might change what header files
are found for these other IMPORTED library targets and may expose many new
warnings (which may have been silenced by their include directories being
pulled in using `-isystem`).
**Approach-3:** Clean up the list of include directories that is searched
by the compiler so that only the correct header files can be found
(regardless of the search order).
**Approach-4:** Delete some header files in the set of searched include
directories so that only the correct header files can be found (regardless
of the search order).
**Approach-5:** Use other approaches more specific to the given customer
project. For example, if multiple different versions of the googletest
(gtest) library header files can be found in the list of include
directories, then a customer project can build its own version of
googletest and put it's include directories first on the compile line and
list them with `-I` to ensure that only that version will be found, no
matter how many other versions of gtest are installed on the system. For
an example of how this was done for one customer CMake project, see
https://github.com/trilinos/Trilinos/issues/8001#issuecomment-1032827124.
For more details on this change in the handling of include directories
with the switch to modern CMake, see
https://github.com/TriBITSPub/TriBITS/issues/443.
###############################################################################
# #
# Trilinos Release 12.12 Release Notes #
# #
###############################################################################
Overview:
The Trilinos Project is an effort to develop algorithms and enabling
technologies within an object-oriented software framework for the solution of
large-scale, complex multi-physics engineering and scientific problems.
Packages:
The Trilinos 12.12 general release contains 58 packages: Amesos, Amesos2,
Anasazi, AztecOO, Belos, CTrilinos, Didasko, Domi, Epetra, EpetraExt, FEI,
ForTrilinos, Galeri, GlobiPack, Ifpack, Ifpack2, Intrepid, Isorropia, Kokkos,
Komplex, LOCA, Mesquite, ML, Moertel, MOOCHO, MueLu, NOX, Optika, OptiPack,
Pamgen, Phalanx, Pike, Piro, Pliris, PyTrilinos, ROL, RTOp, Rythmos, Sacado,
SEACAS, Shards, ShyLU, STK, Stokhos, Stratimikos, Sundance, Teko, Tempus*,
Teuchos, ThreadPool, Thyra, Tpetra, TriKota, TrilinosCouplings, Trios,
Triutils, Xpetra, Zoltan, Zoltan2.
(* denotes package is being released externally as a part of Trilinos for the
first time.)
Domi
- Enhancements
- Added more sophisticated processor decomposition algorithm. If the
decomposition of the processors along each axis is specified
incompletely for two or more axes, Domi now returns a much more
logical decomposition
- Bug fixes
- Fixed memory management error related to Tuple and ArrayView
- Update ParameterList documentation so that they display properly
in HTML documentation
- Fixed bug in MDMap::getAugmentedMDMap() method
Ifpack2
- Multithreaded Gauss-Seidel now builds by default (#288)
Ifpack2's support for multithreaded Gauss-Seidel uses a new
thread-parallel graph coloring algorithm implemented in KokkosKernels.
(KokkosKernels currently lives in tpetra/kernels.) Ifpack2 makes this
algorithm available in Ifpack2::Relaxation. In the 12.10 release,
users had to set CMake configuration options to nondefault values in
order to enable this code. Now, this code builds and is available by
default. (This fixes GitHub Issue #288.) It is still possible to
disable building this code, by setting the following CMake option to
OFF:
- Ifpack2_ENABLE_Experimental_KokkosKernels_Features
Isorropia
- Removed experimental Tpetra interface. The macro that would have
enabled it was commented out, so it could never have built. See
discussion in #1406: https://github.com/trilinos/Trilinos/issues/1406
PyTrilinos
- General
- PyTrilinos now works with both Python versions 2 and 3
- Internally, PyTrilinos now uses relative imports
- Protect against Doxygen version 1.8.13
- Teuchos
- Fix ParameterList __cmp__() operator
- Improved memory management for wrapped version of sublists
- Fixed a memory leak in the definitions for certain directorin
typemaps
- Epetra
- Add AsMap() method to Epetra.BlockMap class
- ML
- Fixed a dangling reference error in an ML example script.
- LOCA
- Fixed a memory leak in LOCA example script
- Fixed a memory leak in the wrappers for the
LOCA::Abstract::Iterator::StepStatus enumeration
- Anasazi
- Fixed a memory leak that PyTrilinos introduced with the
Eigensolution<...>::evecs() and espace() methods
Tempus
Tempus provides a general infrastructure for the time evolution
of solutions to ODEs, PDEs, and DAEs, through a variety of general
integration schemes, and can be used from small systems of
equations (e.g., single ODEs for the time evolution of plasticity
models) to large-scale transient simulations requiring exascale
computing (e.g., flow fields around reentry vehicles and
magneto-hydrodynamics).
- Examples of time-integration methods available are:
- Tempus::StepperForwardEuler "Forward Euler"
- Tempus::StepperBackwardEuler "Backward Euler"
- Tempus::StepperExplicitRK "Explicit Runge-Kutta"
- Tempus::StepperDIRK "Diagonally Implicit Runge-Kutta methods"
- Newmark-β
- Tempus::StepperNewmarkExplicitAForm "Explicit A-form"
- Tempus::StepperNewmarkImplicitAForm "Implicit A-form"
- Tempus::StepperNewmarkImplicitDForm "Implicit D-form"
- Tempus::StepperHHTAlpha "Hilber-Hughes-Taylor (HHT-α)"
- Tempus::StepperIMEX_RK "Implicit/Explicit Runge-Kutta (IMEX-RK) methods"
- Tempus::StepperIMEX_RK_Partition "Partitioned IMEX-RK methods"
###############################################################################
# #
# Trilinos Release 12.10 Release Notes #
# #
###############################################################################
Overview:
The Trilinos Project is an effort to develop algorithms and enabling
technologies within an object-oriented software framework for the solution of
large-scale, complex multi-physics engineering and scientific problems.
Packages:
The Trilinos 12.10 general release contains 58 packages: Amesos, Amesos2,
Anasazi, AztecOO, Belos, CTrilinos, Didasko, Domi, Epetra, EpetraExt, FEI,
ForTrilinos, Galeri, GlobiPack, Ifpack, Ifpack2, Intrepid, Isorropia, Kokkos,
Komplex, LOCA, Mesquite, ML, Moertel, MOOCHO, MueLu, NOX, Optika, OptiPack,
Pamgen, Phalanx, Pike, Piro, Pliris, PyTrilinos, ROL, RTOp, Rythmos, Sacado,
SEACAS, Shards, ShyLU, STK, Stokhos, Stratimikos, Sundance, Teko, Teuchos,
ThreadPool, Thyra, Tpetra, TriKota, TrilinosCouplings, Trios, Triutils, Xpetra,
Zoltan, Zoltan2.
(* denotes package is being released externally as a part of Trilinos for the
first time.)
Ifpack2
- Experimental multithreaded Gauss-Seidel
This uses a new thread-parallel graph coloring algorithm implemented
in KokkosKernels. Ifpack2's support for this lives in
Ifpack2::Relaxation. Currently, building it is disabled by default
(see #288). Enabling it requires enabling the following CMake options
that are currently OFF by default:
- TpetraKernels_ENABLE_Experimental
- Ifpack2_ENABLE_Experimental
- Ifpack2_ENABLE_Experimental_KokkosKernels_Features
- Ifpack2::Krylov is really SUPER deprecated now
It's been deprecated for a LONG time, complete with deprecated
warnings. This didn't suffice for warning some users, so I moved the
class to the new Ifpack2::DeprecatedAndMayDisappearAtAnyTime
namespace.
- Encapsulate local sparse triangular solves in a new class,
LocalSparseTriangularSolver
- Fix various issues
Issues fix include (but are not limited to) #672, #570, #567, #558,
#551, #544, #409, #234, and #64.
Tpetra
- Build time and size improvements (fix #700)
KokkosKernels now only pre-builds the sparse matrix-vector multiply
kernels that Tpetra needs. Also, for integer Scalar types,
KokkosKernels no longer optimizes sparse matrix-vector multiply for
multiple right-hand sides. It does so only for non-integer (e.g.,
floating-point) Scalar types. This reduces build time and size. (See
Github Issue #700.) Furthermore, KokkosKernels now only pre-builds
sparse matrix-vector multiply for the default offset type.
- Removed "using Teuchos::*" declarations from Tpetra_ConfigDefs.hpp
Tpetra no longer imports Teuchos classes like Comm and RCP (among
others) into the Tpetra namespace. This will help us eventually
remove all the Teuchos_*.hpp header file includes from
Tpetra_ConfigDefs.hpp, thus improving build time.
- MultiVector: Add new two-argument randomize(min,max)
- MultiVector: Get rid of old-interface DistObject methods
Tpetra::MultiVector implements the new DistObject interface. Thus, it
no longer needs to provide implementations for the following three
old-interface DistObject methods:
- createViews
- createViewsNonConst
- releaseViews
- Optimize Map::replaceCommWithSubset for MPI_COMM_SELF (#673)
- Fixed many other issues
Issues fixed include (but are not limited to) #699, #680, #638, #617,
#607, #603, #601, #597, #561, and #46.
###############################################################################
# #
# Trilinos Release 12.8 Release Notes #
# #
###############################################################################
Overview:
The Trilinos Project is an effort to develop algorithms and enabling
technologies within an object-oriented software framework for the solution of
large-scale, complex multi-physics engineering and scientific problems.
Packages:
The Trilinos 12.8 general release contains 58 packages: Amesos, Amesos2,
Anasazi, AztecOO, Belos, CTrilinos, Didasko, Domi, Epetra, EpetraExt, FEI,
ForTrilinos, Galeri, GlobiPack, Ifpack, Ifpack2, Intrepid, Isorropia, Kokkos,
Komplex, LOCA, Mesquite, ML, Moertel, MOOCHO, MueLu, NOX, Optika, OptiPack,
Pamgen, Phalanx, Pike, Piro, Pliris, PyTrilinos, ROL, RTOp, Rythmos, Sacado,
SEACAS, Shards, ShyLU, STK, Stokhos, Stratimikos, Sundance, Teko, Teuchos,
ThreadPool, Thyra, Tpetra, TriKota, TrilinosCouplings, Trios, Triutils, Xpetra,
Zoltan, Zoltan2.
(* denotes package is being released externally as a part of Trilinos for the
first time.)
Domi
- Added replicated boundaries
- A replicated boundary exists only on a periodic domain, and is
simply a convention that the end points are the same points. For
example, a left end coordinate that represents 0 degrees and a
right end coordinate that represents 360 degrees. Domi now
supports either convention, and it affects communication.
- Added additional tests for periodic domains
- Enhancements
- New MDVector constructor that takes a parent MDVector and an array
of Slices
- MDMap support for axis maps
- MDMap getMDComm() method
PyTrilinos
- General
- Improved formatting in example scripts
- Domi
- Update MDMap constructor for replicated boundaries
- Fixed ETI bugs
- NOX/LOCA
- Fixed memory leak by updating NOX typemaps
- Tpetra
- Fix difficult-to-wrap Map class by using %inline
Tpetra
- Stop creating Node instances explicitly!
Hi users! Please don't create Node instances explicitly any more.
Tpetra::Map creates one for you, if you really need one. You really
don't need Node instances: Map's constructors and nonmember
"constructors" don't need them any more, nor do Tpetra's Matrix Market
readers.
Creating Node instances explicitly causes issues with Kokkos
initialization. Node will go away eventually, in favor of Kokkos
execution spaces and memory spaces.
- Lots of bug fixes, especially for CUDA
- Computing offsets in CrsGraph and CrsMatrix is now thread parallel
CrsGraph's and CrsMatrix's fillComplete method computes row offsets,
if they have not yet been computed. This is now thread parallel. It
uses Kokkos::parallel_scan.
- More BlockCrsMatrix kernels are thread parallel
- Interface changes to KokkosSparse::CrsMatrix (the "local" matrix)
- The replaceValues and sumIntoValues methods now take "is_sorted" and
"force_atomic" arguments. These methods now use binary search
(falling back to linear search for short rows) for the sorted case.
- Row views in KokkosSparse::CrsMatrix are no longer templated. They
now use the ordinal type, rather than the offset type, for indexing.
This suffices as long as there are not enough duplicate entries in a
row to exceed ordinal_type. This has the beneficial side effect of
reducing the number of local sparse matrix-vector multiply kernel
instantiations.
- Got rid of LittleBlock and LittleVector (for Block* classes)
Instead, use the little_block_type, const_little_block_type,
little_vec_type, and const_little_vec_type typedefs in BlockCrsMatrix
and other related classes. Underlying data layout has NOT changed
(yet), but constructors HAVE changed. This is technically a
non-backwards-compatible interface change, but all these classes are
in an Experimental namespace anyway.
- Got rid of KokkosClassic::DefaultArithmetic
Stokhos was using this, so we had left it in place in previous
releases for backwards compatibility. Now that no other packages
depend on it, we have gotten rid of it for good. Its functionality
has been replaced by various functions in TpetraKernels.
The original idea behind DefaultArithmetic, as suggested in the name,
was that users could swap out this "default" implementation of
multivector operations with their own implementations. This is
generally less useful than swapping out the implementation of sparse
matrix kernels (like sparse matrix-vector multiply or sparse
triangular solve). As a result, Tpetra never had an implementation
(since at least January 2010) of multivector operations other than
DefaultArithmetic.
ROL
- NEW FEATURES
- Methods
- New phi-divergence capabilities for distributionally-robust
optimization.
- NonlinearLeastSquaresObjective functionality enables the solution of
nonlinear equations through the EqualityConstraint object.
- Infrastructure
- Composite bound constraint (ROL_BoundConstraint_Partitioned).
- Composite equality constraint (ROL_EqualityConstraint_Partitioned)
- Merit function for interior point methods.
- Adapter for Teuchos::SerialDenseVector.
- L1, Lp, Linf norms for interior point methods.
- Allow user-defined bracketing objects.
- Line searches can take user-defined scalar minimizers.
- Ability to supply ScalarMinimizationLineSearch with custom
ScalarFunction.
- New application development and interface tools for PDE-constrained
optimization in PDE-OPT.
- New PDE-OPT examples: stochastic Stefan-Boltzmann, stochastic
advection-diffusion, etc.
- Adaptive sparse grid capabilities with TriKota.
Zoltan
- Improved robustness of RCB partitioner for problems where many objects have
weight = 0 (e.g., PIC codes). Convergence is faster and the stopping
criteria are more robust.
- Fixed bug that occurred when RETURN_LIST=PARTS and (Num_GID > 1 or
Num_LID > 1); GIDs and LIDs are now copied correctly into return lists.
- Fixed a bug related to struct padding in the siMPI serial MPI interface.
Zoltan2
- Graph/Matrix ordering
- Scotch now can be used for graph/matrix ordering.
- The ordering interface Zoltan2::OrderingSolution has been updated
to allow users to access separator info, if it is available.
- Zoltan2::OrderingSolution method getPermutation() is now
getPermutationView().
- Partitioning Metrics
- Partitioning metrics have been moved out of the PartitioningProblem.
They are now accessed through a separate class:
Zoltan2::EvaluatePartition.
- EvaluatePartition accepts as input a
Zoltan2::Adapter and, optionally, a Zoltan2::PartitioningSolution.
Thus, it can be used before or after partitioning, and before or
after migration.
- Imbalance and graph metrics are available.
- Task placement
- A new PartitionMapping class maps parts to processors.
- The MachineRepresentation has been updated, and specializations using
Cray RCA and IBM TopoMgr are provided.
- Geometric task placement using Multijagged partitioning better handles
cases where the machine's network dimension is greater than the
dimension of the coordinates.
- Multijagged partitioning
- Zoltan2's Multijagged partitioner can now partition wrt the longest
coordinate dimension, or in specified x-y-z order.
- TPLs
- Conversions between the index types in TPLs (ParMETIS, Scotch, Zoltan)
are handled more robustly through the TPL_Traits class.
- Interfaces to ParMETIS' AdaptiveRepart and RefineKway algorithms were
added.
- Bugs in the Zoltan interface are fixed.
###############################################################################
# #
# Trilinos Release 12.6 Release Notes #
# #
###############################################################################
Overview:
The Trilinos Project is an effort to develop algorithms and enabling
technologies within an object-oriented software framework for the solution of
large-scale, complex multi-physics engineering and scientific problems.
Packages:
The Trilinos 12.6 general release contains 58 packages: Amesos, Amesos2,
Anasazi, AztecOO, Belos, CTrilinos, Didasko, Domi, Epetra, EpetraExt, FEI,
ForTrilinos, Galeri, GlobiPack, Ifpack, Ifpack2, Intrepid, Isorropia, Kokkos,
Komplex, LOCA, Mesquite, ML, Moertel, MOOCHO, MueLu, NOX, Optika, OptiPack,
Pamgen, Phalanx, Pike, Piro, Pliris, PyTrilinos, ROL, RTOp, Rythmos, Sacado,
SEACAS, Shards, ShyLU, STK, Stokhos, Stratimikos, Sundance, Teko, Teuchos,
ThreadPool, Thyra, Tpetra, TriKota, TrilinosCouplings, Trios, Triutils, Xpetra,
Zoltan, Zoltan2.
(* denotes package is being released externally as a part of Trilinos for the
first time.)
Ifpack2
- Fixed Ifpack2's part of Bug 6358
Ifpack2, as well as its tests and examples, no longer require
GlobalOrdinal = int to be enabled in Tpetra.
- Fixed Bug 6443
One unit test for RILUK had an excessively tight tolerance for Scalar
= float. This commit relaxes the tolerance in a principled way. As a
result, the test now passes.
ROL
- Enhancements:
- Default template parameters for ROL::TpetraMultiVector.
- StdVector, TpetraMultiVector, and PartitionedVector now do
dimensional compatibility checks.
- More unary and binary elementwise functions added.
- New Features:
- Methods:
- InteriorPointStep class, and classes it uses (e.g. PenalizedObjective,
InequalityConstraint, and CompositeConstraint) to solve Interior Point
problems with the CompositeStep SQP solver with successive penalty
reduction.
- Standalone GMRES solver in the Krylov directory.
- Mixed quantile risk measure.
- New risk measure corresponding to Kullback-Liebler based
distributionally robust optimization.
- SROM SampleGenerator: The associated samples are determined
by solving an optimization problem. Current objective functions
correspond to moment matching and the squared L2 error between
distribution functions.
- The PDE-OPT Application Development Kit (ADK) enables the rapid
prototyping of large-scale risk-averse optimization problems with
PDE constraints. The PDE-OPT ADK comprises three key modules:
-- degree-of-freedom manager, which enables the use of an arbitrary
number of simulation, control, and design fields based on finite
element discretizations, on 1D, 2D and 3D meshes;
-- finite element assembly loops and data structures that enable the
development of a variety of multiphysics components, built on
Intrepid for local finite element computations and Tpetra for
parallel linear algebra data structures;
-- interface between the physics module and the SimOpt programming
interface.
- Infrastructure:
- OptimizationProblem class unifies Algorithm::run interface.
- StochasticProblem allows for the construction of a general
stochastic objective function based on input parameters.
- Generalized CVaRVector to RiskVector. This allows for a very general
treatment of risk-averse optimization problems.
- Risk measure factory.
- Default solve implementation for EqualityConstraint_SimOpt.
- BoundConstraint capability for Interior Point problems with and
without Equality Constraints.
Tpetra
- Better CUDA testing
We added more nightly test builds with CUDA enabled (for running on
NVIDIA GPUs). The builds test various combinations of CUDA with
different compiler versions and host thread parallelism options
(OpenMP, Pthreads, serial). CUDA + GCC 4.7.2 is currently the
best-tested option, but we're using these tests to improve support for
other options.
- CrsMatrix, MultiVector, Vector: Added 'atomic' option to sumInto
The sumIntoLocalValues method in Tpetra::CrsMatrix, and the
sumIntoLocalValue and sumIntoGlobalValue methods in
Tpetra::MultiVector and Tpetra::Vector, now take an optional bool
'atomic' argument. If true, the methods use Kokkos::atomic_add
(atomic +=); if false, they use (non-atomic) += as before.
This lets different threads call the methods concurrently on the same
entry/ies of the matrix, multivector, or vector. To support this, I
also modified CrsMatrix::sumIntoGlobalValues so that it does not
change Teuchos::RCP reference counts, thus making it thread safe.
The default value of 'atomic' depends on the class' execution space.
If the execution space is Kokkos::Serial (no threads), atomic is false
by default; else, it is true by default. This ensures that existing
MPI-only codes do not need to pay the (small integer factor) overhead
of atomic updates, while making sumInto always correct by default when
using thread parallelism.
If you know that different threads will never access the same entries
concurrently, you should set atomic=false for best performance.
- Block(Multi)Vector: Add "offset view" constructors (Bug 6450)
Tpetra::Experimental::{BlockMultiVector, BlockVector} now have two
"offset view" constructors. They behave analogously to the offsetView
and offsetViewNonConst methods of Tpetra::MultiVector.
The constructors view an existing BlockMultiVector with a different
mesh Map, and an optional local row offset from which to start the
view on each process. The offset is a mesh offset (it gets multiplied
by the block size internally in order to find the point offset). The
two constructors differ only in that one lets you supply the new point
Map, while the other computes it for you.
This fixes Bug 6450 (which was a feature request).
Zoltan